Preparation And Characterization Of
Activated Carbon/zeolite Composites
From Industrial Solid Wastes
Author(s)
R. Sasai, T. Mizutani & H. Itoh
Abstract
It is necessary to develop a novel method for preparing useful functional
materials from the industrial solid wastes (ISWs) so as to decrease the amount of
ISWs landfilled in the dump yard. The preparation of the carbon/zeolite (CZ)
composites from the inorganic/organic ISWs mixture was investigated. Coal fly
ash (CFA) and sawdust (SD) were used as inorganic and organic ISWs,
respectively. After adding the activator (Na2CO3 or K2CO3) in aqueous solution
to the mixture of CFA, SD, and bentonite as caking additive, the mixture was
kneaded and extruded as a cylindrical shape. The dried green body was activated
at 600 to 850oC for 1 hour in N2 atmosphere. This activated cylindrical black
body was hydrothermally treated in a Teflon-sealed pressure vessel with
2 mol/dm3 NaOH aqueous solution at 120oC for 24 hours. The XRD patterns of
the prepared composites had diffraction peaks of P-type zeolite together with
quartz and mullite contained in the original CFA. It is found that the CZ bulk
composites can be prepared by the hydrothermal alkalin treatment of the reagentactivated
bulk body. The CZ composites with Na2CO3 prepared at 700oC had a
specific surface area of 1,300 m2/g-carbon and a cation-exchangeable capacity of
180 mequiv./100g-inorganic. This result indicates that the present material can
remove simultaneously both non-polar and cationic contaminants from
wastewater.
1 Introduction
In Japan, nearly 40 million tons of the industrial solid wastes (ISWs) are
discharged every year. The total amount of these ISWs is reduced by some kinds
Keywords
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